<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise.race</title>
</head>
<body>
    <script>
        // Promise.race 方法   race 赛跑, 批量操作 promise
        // 参数: 数组  [p1, p2]
        // 返回: promise 实例对象
                //状态和结果值: 由数组中最先改变状态的 promise 决定
            
        let p1 = new Promise((resolve, reject) => {
            setTimeout(() => {
                resolve("OK");
            }, 100);
        });

        let p2 = Promise.reject('error');

        //调用 race 方法
        let result = Promise.race([p1, p2]);
        
        result.then(v => {
            console.log(v);
        }, r => {
            console.log(r);
        })
        
    </script>
</body>
</html>